Generalized entanglement distillation

TL;DR

This paper introduces a novel entanglement distillation protocol that uses weak cross-Kerr nonlinearity to efficiently purify mixed states into high-quality entangled states without complex detectors, enhancing practical quantum communication.

Contribution

It proposes a new entanglement distillation method where each component of the mixed state is less-entangled but maximally entangled, avoiding the need for sophisticated detectors.

Findings

Protocol effectively distills high-quality entangled states.

Does not require sophisticated single-photon detectors.

Allows iterative distillation for improved entanglement quality.

Abstract

We present a way for the entanglement distillation of genuine mixed state. Different from the conventional mixed state in entanglement purification protocol, each components of the mixed state in our protocol is a less-entangled state, while it is always a maximally entangled state. With the help of the weak cross-Kerr nonlinearity, this entanglement distillation protocol does not require the sophisticated single-photon detectors. Moreover, the distilled high quality entangled state can be retained to perform the further distillation. These properties make it more convenient in practical applications.